Pin-on-disc apparatus was used to investigate the effect of temperature on the dry sliding friction characteristics of a Zr-based bulk metallic glass (BMG) near its glass transition temperature (T g = 625 K) (an analogous phenomenon in crystalline metals called the ductile-brittle transition). Unexpected variation in frictional behavior was observed in the temperature range of 603-643 K, suggesting that the glass transition and formation of protective oxide layers played roles in the tribological properties of BMG. An explanation of the behavior is given based on Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDS) analysis.
MoSi2 was prepared by SHS, and then pressed under 300 MPa at room temperature and
sintered at 1600 °C for 1 h in a vacuum furnace. The tribological properties of MoSi2 against Al2O3 in the
temperature range from 700°C to 1100 °C were investigated. Microphotographs and phases of the worn
surface of MoSi2 were observed by SEM and XRD. Results showed that MoSi2 has well friction and wear
properties below 900 °C. When temperature rises from 900 °C to 1000 °C, wear rate of MoSi2 is raised by
20.8% which is attribute to the change of wear mechanism. The main wear mechanisms of MoSi2 are
adhesion and oxidation at high temperatures. When over 900 °C, because of ductile - brittle transition
characteristic of this material, plastic deformation and fracture are also found on the worn surface of
MoSi2. This leads to the high wear rate of MoSi2.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.